For the purposes of the present document, the terms and definitions given in
TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in
TR 21.905.
Fallback band combination:
A band combination that would result from another band combination (parent band combination) by releasing at least one SCell or uplink configuration of SCell. A fallback band combination supports the same channel bandwidths for each carrier as its parent band combination. An intra-band non-contiguous band combination is not considered to be a fallback band combination of an intra-band contiguous band combination.
NB-IoT:
NB-IoT allows access to network services via E-UTRA with a channel bandwidth limited to 200 kHz (corresponding to one PRB).
Primary Cell:
The cell, operating on the primary frequency, in which the UE either performs the initial connection establishment procedure or initiates the connection re-establishment procedure, or the cell indicated as the primary cell in the handover procedure. In this specification, Primary Cell also refers to PSCell defined in
TS 36.331 unless explicitly stated otherwise.
Sidelink:
UE to UE interface for sidelink communication, V2X sidelink communication and sidelink discovery. The Sidelink corresponds to the PC5 interface as defined in
TS 23.303.
Sidelink communication:
AS functionality enabling ProSe Direct Communication as defined in
TS 23.303, between two or more nearby UEs, using E-UTRA technology but not traversing any network node. In this version, the terminology "sidelink communication" without "V2X" prefix only concerns PS unless specifically stated otherwise.
Sidelink discovery:
AS functionality enabling ProSe Direct Discovery as defined in
TS 23.303, using E-UTRA technology but not traversing any network node.
V2X sidelink communication:
AS functionality enabling V2X Communication as defined in
TS 23.285, between nearby UEs, using E-UTRA technology but not traversing any network node.
For the purposes of the present document, the abbreviations given in
TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in
TR 21.905.
1xRTT
CDMA2000 1x Radio Transmission Technology
ACK
Acknowledgement
ACDC
Application specific Congestion control for Data Communication
ANDSF
Access Network Discovery and Selection Function
ANR
Automatic Neighbour Relation
BCCH
Broadcast Control Channel
CAS
Cell Acquisition Subframes
CFI
Control Format Indicator
CG
Cell Group
CRS
Cell-specific Reference Signal
CSG
Closed Subscriber Group
CSI
Channel State Information
DC
Dual Connectivity
DCI
Downlink Control Information
DL-SCH
Downlink Shared Channel
EHC
Ethernet Header Compression
E-UTRA
Evolved Universal Terrestrial Radio Access
E-UTRAN
Evolved Universal Terrestrial Radio Access Network
FDD
Frequency Division Duplex
GERAN
GSM/EDGE Radio Access Network
HARQ
Hybrid Automatic Repeat Request
HRPD
High Rate Packet Data
HSDN
High Speed Dedicated Network
IRC
Interference Rejection Combining
MAC
Medium Access Control
MMSE
Minimum Mean Squared Error
MO-EDT
Mobile Originated Early Data Transmission
MRO
Mobility Robustness Optimisation
MT-EDT
Mobile Terminated Early Data Transmission
MTSI
Multimedia Telephony Service for IMS
MUST
MultiUser Superposition Transmission
NAICS
Network Assisted Interference Cancellation/Suppression
NB-IoT
Narrow Band Internet of Things
OS
OFDM Symbol
PCell
Primary Cell
PDCCH
Physical Downlink Control Channel
PDCP
Packet Data Convergence Protocol
PDSCH
Physical Downlink Shared Channel
PHR
Power Headroom Reporting
ProSe
Proximity-based Services
PUCCH
Physical Uplink Control Channel
PUR
Preconfigured Uplink Resource
PUSCH
Physical Uplink Shared Channel
QoE
Quality of Experience
RACH
Random Access CHannel
RAI
Release Assistance Indication
RAT
Radio Access Technology
RLC
Radio Link Control
RLF
Radio Link Failure
ROHC
RObust Header Compression
RRC
Radio Resource Control
SC-PTM
Single Cell Point to Multipoint
SCC
Secondary Component Carrier
SCell
Secondary Cell
SI
System Information
SL
Sidelink
SL-DCH
Sidelink Discovery CHannel
SL-SCH
Sidelink Shared CHannel
SON
Self Organizing Networks
SPT
Short Processing Time
SR
Scheduling Request
SSAC
Service Specific Access Control
SSTD
SFN and Subframe Timing Difference
STTI
Short TTI
TDD
Time Division Duplex
TTI
Transmission Time Interval
UCI
Uplink Control Information
UDC
Uplink Data Compression
UE
User Equipment
UL-SCH
Uplink Shared Channel
UMTS
Universal Mobile Telecommunications System
UTRA
UMTS Terrestrial Radio Access
V2X
Vehicle-to-Everything
WLAN
Wireless Local Area Network